Philips PM 5508 Operating Manual page 45

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Fig. VI I-22. Incorrect subcarrier phase to both demodulators (R-Y) and (B-Y)
6. • In some receivers the subcarrier phase to both demodulators can
be varied only simultaneously. In that case first adjust, for example,
the (R-Y) demodulator to obtain a correct adjustment for bar 2 and
then the (B-Y) demodulator for correct quadrature by observing bar
3, or vice versa. Since there may be considerable interaction
between these adjustments, they often have to be repeated several
times, see Fig. VII-22.
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